Lecturer&#39;s chart



Aug. 14, 1923.,

L. P. DENOYER LECTURER S CHART Filed March 2, 1922 JHZ/BZACK.

avvvawtoz CW O Patented 1%, i923.

L Q m m LEVINUS PHILIP DENOYEB, GE CHIGAG-Q TTV -CO., 913 CEEGAG- Application filed March 2, 1922. Serial No. 40,547.

To all whom it may concern: as rivers, mountains, rail? Bait: known that l, LnviNUs PfDnNoynn, hly printed. die; A a citizen of the United States, residing cheated on the backs 01.1

,. Chic o, in the county of Cool: and State citliei brok n or unbrolit, 5 of Tll -ois, have invented certain new and same colored inl: as aid be so useful Improvements in Lecturers Charts; possessing sufficient lustre t and i do declare the following to be a full, lines to be seen bv the leco clear, and exact description of the invento the map. From the dis. .ce. he. i tion. such as will enable others skilled in the dicating lines cannot be 9 art to which it appertains to maize and use It will be seen that the invention a-bore th 83mg, described will be of great assistan' e to My invention relates to charts or maps teachers and other lecturers in p "we; out such as those used by school teachers and different features of interest do a the other lecturers and one object is to provide course of a lecture, and temporarily show c iart in which the Irwin lines .01 demarlrainn; them upon the chart by use of chall: or tion are distinctly visiole to the class of stuother crayons. After lecture, however, the dents or others, while details such as rivers, @DIPOlSlf-F lines may be readily erased.v leer mountain ranges, cities, railways and other ing the chart in readiness for another 1 natural or man-made features are desigture. nated by indicating lines of the same color While have i as the backgroundof the chart, said lines means of a being visibl to the lecturer only, so that he understood thr may readily determine the locations, geographical tormatio 0 courses, etc.. of different points of interes chineoroper erections of e while lecturing. i tures, their main outlines ma be A further aim is to provide cach -round printed to be vielol to the of such ture as permit the we 0 craytails such as th l ti f 1 a, 4 ons thereon to temporarily amplifying the girders and the like, may be printed .ais disclosure, dunthe course of t e lecture, trons ink Or the same EFL the back- 30 hvtollowing the indicating lines aoove reground, to be visible only to the teacher. ferred to. In the manufactu e of the maps constrr tl Vith the "foregoing; in view, the invention ed resides in the novel subject matter hereinafter described and claimed, the description 05 being supplemented by the accompanying n accordance with this invention, ti sally no lustre 9!) drawing, which for sake of illustration, dismain outlines or other lines of deina closes a map of the British Isles. 2, and black ink which will possess a The background 1 is formed of cloth or when dry, has been einnloyed tor of other material of any desired color, although the details 3. It is to be undo oo 40 slated cloth of well known characteristics is eve: that colors other than 'tlume which have 9' preferably used. This slated cloth possesses actually been used. may well he employed a dull black surface sufficiently rough to furthermore that the invention not permit the use ct ordinarychalk or crayons ich to any particular details other thereon, and this surface possesses little or than. those specifier. the following. no lustre. 'Printed in permanent ink upon I claim: ice the background 1 are the main lines of de l. A. lecturers chart havingline; of de 11 arl ation 2 of such boldness and color as .marlration clearly visible at a distanc, and to be clearly visible at a distance from the indicating;- lines of the same color as the map. When a black background is used, background 01'? the chartinvisible at a diswhite or yellow is preferably employed in tance but visible to the lecturer when close 1% printing the lines 2, but this is not essential. to the chart. These lin s are usually arranged to give the 2. A lecturers chart having a mar-liable general outlines of any geographical diviand readily cleanable background. said sion or outline of any other area to be dis chart having" permanent lines of demarkacussed, but none or few of the details, such tion provided upon. the background and elf il permanent indicating lines substantially of the same color as the background so as to be invisible at a distance but visible to the 1ec-' turer when close to the chart, serving to guide him in amplii'. 'lng the disclosure by means o1 temporary indicating lines.

3. A lecturers chart having a background permitted of being marked and then readily cleaned, said chart having permanent lines of demarkation distinct in solid color from the background, and permanent faintly lustrous indicating lines of substantially the same color as" said background, said indicating lines being invisible at a distance but visible to the lecturer when close to 'the chart, whereby to guide him in amplifying; the disclosure by means oftemporary indicating llnes.

In testimony whereof I have hereunto set my hand. 

